The Book of Ruth in the Old Testament is much valued by Jews. It is
about a Moabite young woman who elected to join her mother-in-law, who
moved back to Bethlehem after ten years in Moab. Ruth promised to follow
Naomi's God, and to love Him. Both the women were widows - Naomi was now
too old to have children, so held out no hope of finding an husband,
Ruth was much younger, so able to bear children. A prince of Israel, a
kinsman of Naomi's dead husband, named Boaz, heard about Ruth and her
decision to be a full proselyte, and eventually married her, saving her
(and Naomi) from a lifetime of menial work in the fields. Thus a former
pagan was chosen by God to become great-grandmother to David, and part
of the lineage of Jesus Christ.